Ph.D. in Physics, Massachusetts Institute of Technology (1993). B.S. in Physics, National Tsing Hua University (1984).
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1 Ite A. Yu Education Ph.D. in Physics, Massachusetts Institute of Technology (1993). B.S. in Physics, National Tsing Hua University (1984). Employment 2005-present Professor of Physics, National Tsing Hua University Associate Professor, National Tsing Hua University Associate Professor (tenure track), National Tsing Hua University Postdoctral Researcher, Harvard-Smithsonian Center for Astrophysics. Professional Service Director of the Division of Academy and the Executive Board Member, the Physical Society of R. O. C. Taiwan (2014/1-present) Editor, Chinese Journal of Physics (2006/1-present). Convener of the Physics Panel, the Ministry of Science and Technology, Taiwan (2011/1~2013/12). Physics Panel Member, the Ministry of Science and Technology, Taiwan (2008/1-2010/12). Director of the Division of International and Continuing Education, National Tsing Hua University (2006/3-2007/8). Honors and Awards Fellow of the Physical Society of R. O. C. Taiwan since 2014/1. Outstanding Scholar Award, Foundation for the Advancement of Outstanding Scholarship (2013). Ministry of Science and Technology Outstanding Research Award (2012). National Tsing Hua University Outstanding Mentor Award (2009). Research Interests Slow light, storage of light, low-light-level nonlinear optics, quantum memory, quantum optics, and quantum information manipulation. Research Summary In 1997, I established the first experiment of cold atoms in Taiwan. Nowadays, young researchers including my former PhD students (Dr. Ying-Cheng Chen in Academia Sinica and Prof. Yong-Fan Chen in National Cheng Kung University) have made the research fields Last update 2015/3/20 1
2 of cold atoms booming in Taiwan. My research focuses on the studies of electromagnetically induced transparency (EIT) effect and its applications in low-light-level nonlinear optics and coherent storage. Slow and stationary light greatly enhance the interaction time between light and matters, and can make a nonlinear optical process achieve significant efficiency even at single-photon level. Storage of light provides a method of coherent transfer of wave functions between photons and atoms, and can lead to the application of quantum memory. These developments have made great impacts on quantum information manipulation. We are one of the earliest groups in the world that utilize cold atoms in the EIT/slow light experiments [1,2]. Our contributions to the field are described below: (i) We proposed and experimentally demonstrated a new scheme of cross-phase modulation based on the stored light [3]. With the scheme, a single photon phase-modulated by another is feasible, leading to the applications in quantum information manipulation. (ii) We further produced stationary light pulses, i.e. light pulses without motion, in cold atomic media [4]. Our experimental result is equivalent to trapping a light pulse in an optical cavity with a Q factor of about (iii) Combining stored and stationary light, we reported the first experimental demonstration that two light pulses were made motionless and interacted with each other via a medium [5]. The interaction time is, in principle, as long as possible and a considerable efficiency can be achieved even below single-photon level. The result of this work enters a new regime of low-light physics. (iv) Storage efficiency is an important figure of merit of quantum memory. We reported a storage efficiency of 78% with the EIT-based optical memory [6]. This work advances the EIT-related technology and can lead to practical applications in long-distance quantum communication and optical quantum computation. (v) Employing the double-tripod (DT) atom-light coupling scheme, we observed two-component or spinor slow light (SSL) for the first time [7]. Our data showed that stored SSL behaves like an interferometer enabling precision measurements of frequency detuning. Single-photon SSL can be considered as the two-color qubit, the superposition state of two frequency modes. We further demonstrated the DT scheme can be used as quantum memory/rotator for two-color qubits. This work opens up a new direction in the EIT/slow light research and SSL may lead to novel applications in quantum information manipulation, precision measurement, and nonlinear optics. Representative Publications (*: corresponding author Last update 2015/3/20 2 ǂ: research team leader) [1] Y. C. Chen, Y. A. Liao, H. Y. Chiu, J. J. Su, and I. A. Yu,*ǂ Observation of the quantum interference phenomenon induced by interacting dark resonances, Phys. Rev. A 64, (2001). [Times Cited: 72] [2] Y. F. Chen, Z. H. Tsai, Y. C. Liu, and I. A. Yu,*ǂ Low-light-level photon switching by quantum interference, Opt. Lett. 30, 3207 (2005). [Times Cited: 51] [3] Y. F. Chen, C. Y. Wang, S. H. Wang, and I. A. Yu,*ǂ Low-Light-Level Cross-Phase- Modulation Based on Stored Light Pulses, Phys. Rev. Lett. 96, (2006). [Times Cited: 98]
3 [4] Y. W. Lin, W. T. Liao, T. Peters, H. C. Chou, J. S. Wang, H. W. Cho, P. C. Kuan, and I. A. Yu,*ǂ Stationary Light Pulses in Cold Atomic Media and without Bragg Gratings, Phys. Rev. Lett. 102, (2009). [Times Cited: 56] [5] Y. H. Chen, M. J. Lee, W. Hung, Y. C. Chen, Y. F. Chen, and I. A. Yu,*ǂ Demonstration of the Interaction between Two Stopped Light Pulses, Phys. Rev. Lett. 108, (2012). [Times Cited: 20] The 2012 April issue of Nature Physics reports this work in research highlights with the title of Frozen light switch. [6] Y. H. Chen, M. J. Lee, I. C. Wang, S. Du, Y. F. Chen, Y. C. Chen, and I. A. Yu,*ǂ Coherent Optical Memory with High Storage Efficiency and Large Fractional Delay Phys. Rev. Lett. 110, (2013). [Times Cited: 29] The 2013 May issue of Aisa Pacific Physics Newsletter reports this work in research highlights. [7] M. J. Lee, J. Ruseckas, C. Y. Lee, V. Kudriašov, K. F. Chang, H. W. Cho, G. Juzeliūnas, and I. A. Yu,*ǂ Experimental demonstration of spinor slow light, Nature Commun. 5, 5542 (2014). [Times Cited: 0] Contributions to International Conferences or Workshops Since 2010 The 11th Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), Busan, Korea (2015/8). [Invited Talk & Short Course Lecturer] The Conference on Lasers and Electro-Optics (CLEO) 2015, FS 1: Quantum Optics of Atoms, Molecules and Solids, San Jose, U. S. A. (2015/6). [Program Committee Member] The 8th Asia-Pacific Conference and Workshop on Quantum Information Sciences (APCWQIS 2014), Tainan, Taiwan (2014/12). [Invited Talk] The 11th Asian International Conference on Atomic and Molecular Sciences (AISAMP 11), Sendai, Japan (2014/10). [Invited Talk] SPIE Photonic West 2014, San Francisco, U. S. A. (2014/2). [Invited Talk] The 4th International Meeting on Frontiers of Physics (IMFP), Pahang, Malaysia (2013/8). [Plenary Talk] Workshop on Coherent Control of Complex Quantum System (C3QS), Okinawa Institute of Science and Technology, Okinawa, Japan (2013/5). [Invited Talk] The 7th Joint Meeting of Chinese Physicists Worldwide (OCPA7), Natioanl Sun Yat-sen University, Kaohsiung, Taiwan (2011/8). [Invited Talk] Conference on Research Frontiers in Ultracold Atomic and Molecular Gases, Goa, India (2011/1). [Invited Talk] The 5th Asia Pacific Conference on Quantum Information Science (APCQIS), Taiyuan, China (2010/8). [Invited Talk] Last update 2015/3/20 3
4 Publications in the Recent 10 Years 1. W. Hung, P. Huang, F. C. Wu, M. Bruvelis, H. Y. Xiao, A. Ekers, and I. A. Yu, Storage time of cold Rb atoms in an optical dipole trap formed by a multimode fiber laser, to be published in J. Opt. Soc. Am. B. 2. M. J. Lee, J. Ruseckas, C. Y. Lee, V. Kudriašov, K. F. Chang, H. W. Cho, G. Juzeliūnas, and I. A. Yu, Experimental demonstration of spinor slow light, Nature Commun. 5, 5542 (2014). 3. Y. F. Hsiao, P. J. Tsai, C. C. Lin, Y. F. Chen, I. A. Yu, and Y. C. Chen, Coherence properties of amplified slow light by four-wave mixing, Opt. Lett. 39, 3394 (2014). 4. C. K. Chiu, Y. H. Chen, Y. C. Chen, I. A. Yu, Y. C. Chen, Y. F. Chen, Low-light-level four-wave mixing by quantum interference, Phys. Rev. A 89, (2014). 5. H. H. Jen, B. Xiong, I. A. Yu, and D. W. Wang, Electromagnetically induced transparency and slow light in quantum degenerate atomic gases, J. Opt. Soc. Am. B 30, 2855 (2013). 6. Y. H. Chen, M. J. Lee, I. C. Wang, and I. A. Yu, Fidelity of the electromagneticallyinduced-transparency-based optical memory, Phys. Rev. A 88, (2013). 7. W. M. Hsu, Y. H. Chen, J. S. Wang, and I. A. Yu, Slow and stored light pulses in the presence of magnetic fields, J. Opt. Soc. Am. B 30, 2123 (2013). 8. J. Ruseckas, V. Kudrišov, I. A. Yu, and G. Juzeliūnas, Transfer of orbital angular momentum of light using two component slow light, Phys. Rev. A 87, (2013). 9. Y. H. Chen, M. J. Lee, I. C. Wang, S. Du, Y. F. Chen, Y. C. Chen, and I. A. Yu, Coherent Optical Memory with High Storage Efficiency and Large Fractional Delay, Phys. Rev. Lett. 110, (2013). 10. C. C. Lin, M. C. Wu, B. W. Shiau, Y. H. Chen, I. A. Yu, Y. F. Chen, and Y. C. Chen, Enhanced all-optical switching with double slow light pulses, Phys. Rev. A 86, (2012). 11. M. J. Lee, Y. H. Chen, I. C. Wang, and I. A. Yu, EIT-based all-optical switching and cross-phase modulation under the influence of four-wave mixing, Opt. Express 20, (2012). 12. Y. H. Chen, M. J. Lee, W. Hung, Y. C. Chen, Y. F. Chen, and I. A. Yu, Demonstration of the Interaction between Two Stopped Light Pulses, Phys. Rev. Lett. 108, (2012). 13. T. Peters, S. W. Su, Y. H. Chen, J. S. Wang, S. C. Gou, I. A. Yu, Formation of stationary light in a medium of non-stationary atoms, Phys. Rev. A 85, (2012). 14. S. W. Su, Y. H. Chen, S. C. Gou, and I. A. Yu, An effective thermal-parametrization theory for the slow-light dynamics in a Doppler-broadened electromagnetically induced transparency medium, J. Phys. B 44, (2011). Last update 2015/3/20 4
5 15. H. Y. Lo, Y. C. Chen, P. C. Su, H. C. Chen, J. X. Chen, Y. C. Chen, I. A. Yu, and Y. F. Chen, Electromagnetically induced transparency based cross-phase modulation at attojoule levels, Phys. Rev. A 83, (R) (2011). 16. S. W. Su, Y. H. Chen, S. C. Gou, T. L. Horng, and I. A. Yu, Dynamics of slow light and light storage in a Doppler-broadened electromagnetically-induced-transparency medium: A numerical approach, Phys. Rev. A 83, (2011). 17. C. Belthangady, C. S. Chuu, I. A. Yu, G. Y. Yin, J. M. Kahn, and S. E. Harris, Hiding Single Photons with Spread Spectrum Technology, Phys. Rev. Lett. 104, (2010). 18. T. Peters, Y. H. Chen, J. S. Wang, Y. W. Lin, and I. A. Yu, Observation of phase variation within stationary light pulses inside a cold atomic medium, Opt. Lett. 35, 151 (2010). 19. W. T. Liao, T. Peters, E. C. Shen, and I. A. Yu, Propagation, broadening, and energy decay of quasi-stationary light pulses in thermal atoms, Chinese J. Phys. 47, 817 (2009). 20. Y. W. Lin, W. T. Liao, T. Peters, H. C. Chou, J. S. Wang, H. W. Cho, P. C. Kuan, and I. A. Yu, Stationary Light Pulses in Cold Atomic Media and without Bragg Gratings, Phys. Rev. Lett. 102, (2009). 21. T. Peters, Y. H. Chen, J. S. Wang, Y. W. Lin, and I. A. Yu, Optimizing the retrieval efficiency of stored light pulses, Opt. Express 17, 6665 (2009). 22. W. H. Lin, W. T. Liao, C. Y. Wang, Y. F. Lee, and I. A. Yu, Low-light-level all-optical switching based on stored light pulses, Phys. Rev. A 78, (2008). 23. Y. W. Lin, H. C. Chou, P. P. Dwivedi, Y. C. Chen, and I. A. Yu, Using a pair of rectangular coils in the MOT for the production of cold atom clouds with large optical density, Opt. Express 16, 3753 (2008). 24. H. W. Cho, Y. C. He, T. Peters, Y. H. Chen, H. C. Chen, S. C. Lin, Y. C. Lee, and I. A. Yu, Direct measurement of the atom number in a Bose condensate, Opt. Express 15, (2007). 25. P. C. Guan and I. A. Yu, Simplification of the electromagnetically induced transparency system with degenerate Zeeman states, Phys. Rev. A 76, (2007). 26. P. C. Guan, Y. F. Chen, and I. A. Yu, Role of degenerate Zeeman states in the storage and retrieval of light pulses, Phys. Rev. A 75, (2007). 27. Y. F. Chen, Y. M. Kao, W. H. Lin, and I. A. Yu, Phase variation and shape distortion of light pulses in electromagnetically induced transparency media, Phys. Rev. A 74, (2006). 28. Y. F. Chen, P. C. Kuan, S. H. Wang, C. Y. Wang, and I. A. Yu, Manipulating the retrieved frequency and polarization of stored light pulses, Opt. Lett. 31, 3511 (2006). 29. C. Y. Wang, Y. F. Chen, S. C. Lin, W. H. Lin, P. C. Kuan, and I. A. Yu, Last update 2015/3/20 5
6 Low-light-level all-optical switching, Opt. Lett. 31, 2350 (2006). 30. Y. F. Chen, C. Y. Wang, S. H. Wang, and I. A. Yu, Low-Light-Level Cross-Phase- Modulation Based on Stored Light Pulses, Phys. Rev. Lett. 96, (2006). Last update 2015/3/20 6
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